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  #1  
Old 01-19-2022, 01:36 PM
Steve Crewdog's Avatar
Steve Crewdog Steve Crewdog is offline
 
Join Date: Mar 2019
Location: KBVS
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Default Dissimilar metal corrosion: avionics tray?

One of my local experts says I can't use nutplates on my 4043 aluminum avionics tray without powder coating it or I'm going to get dissimilar metal corrosion between the nutplates/cherrymax rivets/4043. Other areas of the SeaRey have nutplates riveted to the aluminum frame (6061T) with cherrymax rivets, so under his logic the build is already flawed in design.


Thoughts?


TIA
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Last edited by Steve Crewdog : 01-19-2022 at 02:34 PM.
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  #2  
Old 01-19-2022, 02:07 PM
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Here's an article on galvanic corrosion -- good read...

https://en.wikipedia.org/wiki/Galvanic_corrosion

Additionally, plate nuts are usually passivated in some way, either via phosphoric acid etch, molybdenum coating, cadmium plating, etc. so they aren't conductive like bare metal.
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  #3  
Old 01-19-2022, 02:30 PM
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You need an electrolyte for galvanic corrosion. I.e., dirty or salty water. If dry, you should have no problem.
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  #4  
Old 01-19-2022, 02:34 PM
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Thanks gents.
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http://seareybuild.blogspot.com/
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